Machine for forming green-sand cores for journal-boxes



(No Model.) v 2 Sheets-Sheet 1.

W. B. STERRI'T. MACHINE FOR FORMING GREEN SAND GORBS FOR JOURNAL BOXES. No. 470,518. Patented Mar. 8, 1892.

2 Sheets-Sheet 2;

(-No Model.)

. W. B. STE-REIT. MACHINE FOR FORMING GREEN SAND 001158 FOR JOURNAL BOXES.

No. 470,518. Patenfie d Mar. 8, 18-92.

Snow Wot @Q WWW/0020 fitter/14014 NITE STATES V PATENT OFFICE.

MACHINE FOR FORMING GREEN-SAND CORES FOR JOURNAL-BOXES.

SPECIFICATION forming part of Letters Patent No. 470,518, dated March 8, 1892.

Application filed July 14; 1891.

To all whom it may concern.-

13c it known that I, WILLIAM B. STERRIiga citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Formm g Green-Sand Cores forJournal-Boxes; and Ido hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompany- 1ng drawings, which form part of this specification.

This invention has relation to machines for making green-sand cores for hollow castings, and has for its object the provision of novel means for compressing green sand into the desired shape and around a suitable core-arbor by the operation'of machinery, so as to obviate the laborious and costly method of preparing dry sand cores now extensively practiced.

My invention relates particularly to machines for making green-sand cores for casting railway journal -boxes, and has or its special object the provision of means for forming a green-sand core for railway jour nal-boxes with the portion of the core which forms the top and bottom of the journal-box in a vertical direction. In some foundries it is customary. to cast journal-boxesin the position in which they set when in use, while in others they are cast lying on the side, and in forming green-sand cores it is desirable to form them in such manner that it will not be necessary to turn them over when placing them in the mold, as a very slight jar is some- 7 times sufficient to destroy the core.

In an application for Letters Patent filed by me December 10, 1890, Serial No. 374,185, I have shown and described a machine for forming green sand cores in the position which the journal-box occupies when in use.

My present invention is designed to provide a machine which will form the greensand cores upon the side; and it consists in the novel construction, combinations, and arrangements of parts, hereinafter described and claimed.

Referring to the accompanying drawings, Figure 1 is a plan view with the removable top of the machine swung to one side. Fig.

$srial No. 399,495. (No model.)

2 is a side elevation with the removable top in position on the machine. Fig. 3 is an end view of the machine. I Fig. 1 is a sectional view 011 the line 0c {13 of Fig. 1, and Fig. 5 is a sectional view on the line y y of Fig. 1.

A A designate the side portions, and B the central portion of the frame, upon which the working parts of the machine are supported. The portion B is securely bolted to the sides A A and is smooth and flat upon top and may be properly termed a table. This table B has an orificecut in it of the exact size and shape of theinside of the side of a journalboX, and in this orifice is fitted a solid plate or block of metal 0, which is moved up and down by mechanism to be presently described, and which constitutes a movable bottom for the core-box. Upon the bottom of the block 0 are formed sockets c c, in which rest the ends of levers d d, pins 0 0 serving to hold the levers in place in the sockets. ends of the lovers d (1 rest in sockets e e on the upper sides of strong curved levers E E, and are held in the sockets by pins d d". The levers E E interlock in the manner of the leaves of a hinge and are fulcrumed upon a bolt f, which passes through hangers F F, depending from the table B. Near the lower ends of the levers E E and upon the inside of the same are formed sockets g g, in which rest the outer ends of two toggle-levers G G,

the levers being held in the sockets by pins g g. The inner ends of the toggle-levers G G rest in sockets h h in a vertically-movable cross-head II and are held in the sockets by pins h h. The cross-head H slides in ways 2' 2' upon the inside of cross-bars I I, which are attached to the side frames A A of the machine, and a short link 70 is pivotally secured to the bottom of the cross-head H, and its lower end is pivotally attached to a strong lever K, which is fulcrumed at 70 to a standard 10 and projects through and is steadied in its movement by avertical slot I in the crossbars I I. By moving the free end of the lever K up or down the movable bottom 0 of The lower the core-box is vertically reciprocated, movsurface of the section L being shaped to correspond with the portion of a core-which forms spond to the formation of the bottom of thesame. The sections L and L form the sides of the core-box and when brought into position for forming a core their inside surfaces coincide exactly with the orifice in the table B. By referring to the sectional view, Fig. 5, it will be seen that the sections L L are hollowed out longitudinally and from their outer sides, and in the hollows are shafts L L which are journaled in bearings Z ion the edges of the side frames A A and have each on 1ts outer end asmall gear-wheelm m, both 'of which mesh with a large gear-wheel M, which is journaled on a stud M, that projects from theside frame A of the'machine. Flat plates N N are placed across the open sides of the sections L L and are secured by bolts an, and upon the shafts L Ltinside these plates are fixed cams L L that bear upon the plates N N and upon the vertical Walls of the sections L L, and serve when the shafts L L are turned to cause the sections to be simultaneously moved inwardly or outwardly, accordingly as the'shafts move in one direction or the other. A lever M projects from the large gear-wheel M, and by means of this lever the said wheel M is moved whenever it is desired to cause the sections L L to advance toward or recede from one another.

0 designates the top of the core-box, which is attached to the end of a screw 0, passing through a swinging arch 0 which is pivoted at one end to one of the side frames of the machine by an upright bolt 0 and at the other end abuts against a standard 0 on the other side frame, a toe 0 on the arch entering a cavity 0 in the side of the standard and serving to prevent that end being lifted when the top 0 of'the core-box is forced down by the screw 0., Pins 0 0 project downwardly from the arch and pass through holes in the top O, and serve to guide and steady the top in its movements.

Pdesignates the core-arbor, which is a flat bar of metal sustained in the core-box by being supported at one by the straight vertical plate P and at the other end by the bent vertical plate P The ends of the core.bar pass through'the holesin the plates P P and wedge-shaped keys 1; p are driven through holes in the bar to maintain the parts in their proper relative positions.

As the core-arbor and its appurtenant parts form' no part of my present invention, being already secured to me by LettersPatent, it need not be more particularly described.

The dust-chamber of the journal-box is formed by placing in the core-box and confining with the green sand a dry-sand dustchamber core R. A concave block S is formed on the bottom 0 and rises on one side of the core R when the said bottom is elevated, and

a slide T, which is cut out on its upper edge to conform to the concavity of the block S, passes through a slot in the bottom and rises on the other side of the core R. A block U fits down over the top of the core R and has two edges 0 4" that coincide with the concave block S and the slide T. The sides r r, the concave block S, and the slide T are cut away so as to leave an oblong opening, which corresponds to the openingin the end of the journal-box when cast. The slide T passes through a slot in the movable bottom C, as before stated, and is connected by a link t to a lever V, by means of which the slide may be raised and lowered, as desired. A latch on the lever V serves to keep the lever and. the slides in their elevated positions, engaging for this purpose with a notch inthe end. frame A.

The apparatus constructed as described is. operated in the following manner: The parts.

being in the positions shown in Fig. 1-that is to say, the bottom 0 lowered, the slide T raised, the sectionsL L brought toward one another to their fullest extent of motion, the. top raised, the arch swung back, and the core arbor and the dry-sand core in their proper positions-the green sand is now poured'into the space between the sections L L and the end plates of the core-arbor until the space is completely filled. The arch O is then swung around into position and the screw 0 turned, forcing the top down onto the sand in the core-box. A portion of the bottom of the top is in slight relief and corresponds to the shape of the core-box and is forced down into the same by the action of the screw. The lever K is now pressed down, and this motion of the lever raises the bottom 0, thus compressing the sand tightly in the core-box and around the core-arbor and completely forming the green-sand core. The block U is now lifted out through a hole U, which is left for that purpose in the top of the core-box, and the slide T is lowered by releasing the latch 12 on the lever V. The top O is now raised by turning the screw 0, and the arch O is swung around, carrying the toplOa way from over the core-box. The lever K is then raised, thus lowering the'bottomG. Thesections L L are now moved outwardly by turning the gear-wheel M, and the completed core now hangs suspcndedon the arbor which is supported at its ends by the vertical plates;P P resting on the table B, outside the orifice through which the bottom 0 works.

Having fully described my invention, 1

claim- 1. In a machine for forming green-sand cores for journal-boxes, the combination of a stationary table having an orifice corresponding to the shape of the sand core for ajournal-box, a vertically-movable block. fitted. to said orifice and constituting the bottom of a core-box, a movable top adapted to cover and close the core-box with movable sections constituting the sides of the core-box, and mechanism, substantially as described, for moving the sides inwardly and outwardly and for vertically moving the bottom, as set forth.

2. In a machine for forming green-sand cores, the combination of the stationary table be formed, the vertically-reciprocating bot tom 0, connected to and operated by the lever K, and intervening connections With the movable sides L L, the shafts L L carrying cams L L which contact with and move the said sides L L, and means, substantially as described, for simultaneously revolving said shafts, as set forth. v

In testimony that I claim the foregoing I have hereunto set my hand this 26th day of June, 1891.

WILLIAM B. STERRIT. Witnesses:

J 0s. B. OoNNoLLY, D. J. THOMAS. 

